Method for drawing slivers



Jan. 8, 1946. B. G. H. VAN DER JAGT,

Filed Dec. 9, 1942 BY ATTORNEY.

Patented Jan. 8, 1946 UNITED STATES PATEN METHOD FOR DRAWING SLIVEBS Barend Gysbertus Hendrikns van der .Iagt, New York, Y.

Application December 9, 1942, Serial No. 468,352

2 Claims.

slivers, in such a manner as to avoid toa large degree the frequent breaking of the drawn sliver.

Another object of the invention is to force tightly and adhesively felted slivers of hard, short fibers entering the drawing path of a drawin frame into an immediate and deep engagement with the drawing needles.

Still another object of my invention is, 'in the use of a drawing frame comprising, a series of fallers carrying tapered drawing needles, and means to advance said fallers along a predetermined drawing path to feed the short, hard and tacky fibers to the front end of the drawingpath in such a manner that they are forced to enterdeeply between the drawing needles and to withdraw the sliver at the rear end of the drawing path so as to cause an easy and smooth disengagement thereof from the V-shaped interstices between adiacent drawing needles.

These and other objects which will become apparent as the description proceeds, are accomplished, according to the present invention, by the combination of steps specified in the following detailed description, defined in the appended claims and illustratively exemplified in the accompa sing drawing, in which Fig. 1 is substantially a longitudinal diagrammatic section of a drawing machine for carrying out the method according to the invention, and

Fig. 2 is partly an end elevation of this machine and partly across-section taken on line 2-,-2 of Fig. 1.

Referring to the drawing, I and 2 denote trans port rollers adapted to supply a preformed sliver 3, for instance of cocoanut fibers treated with a tacky adhesive and being in a tacky condition, I to the ultimate feed roller I. A pair of drawing rollers including a top drawing roller 5 and a wardly out of the bottoms of the V-shaped interstices Ill between adjacent drawing needles drawing cylinder 6 are arranged at a distance.

forwardly of the feed roller 4. A series of fallers I carrying tapered drawing needles 8 are movably interposed between the feed roller 4 and the drawing cylinder 8, means (not shown) being provided to advance said fallers along a drawing path extending substantially from the feed'roller l to the drawing cylinder 6 in such a manner that the bases of the drawing needles 8 move in a prede-v termined drawing plane 9 (indicated by dot and dash line). At the end of the drawing path the fallers are moved downward in the usual manner j I and return on a lower level to their starting point.

According to the invention, the feed roller 4 and the drawing cylinder't are so arranged relative to each other and to the drawing plane 9, that the latter coontains chords of both, the feed roller and the drawing cylinder. In the embodiment shown, the feed roller 4, which has its axis disposed above the horizontal drawing plane 9, projects downwardly to a point about of one inch below said plane, while the drawing cylinder 6, the axis of which is disposed below the draw- 7 ing plane 9, projects about of wardly beyond said plane.

I have found that the breaking of drawn slivers consisting of hard, coarse and short fibers, which was heretofore very frequent especially in cases where such slivers were drawn after application of-a tacky adhesive to the fibers, was caused mainly by a downward jamming and wedging of the coarse and tacky fiber masses into the bottoms of the V-shaped interstices between adjacent drawing needles.

By the arrangement of the drawing cylinder 6 with its periphery projecting to a certain extent one inch upabove the drawing plane 9, the drawn sliver 3 is pulled, near the end of the drawing path, up-

8, thereby preventing any Jamming or wedging down of the silver into these V-shaped interstices and eliminating the main cause for the breaking of thefibers.

Moreover, by using this method whichinsures a smooth and easy disengagement of the silver from the V-shaped interstices between the drawing needles at the end of the drawing path, it is possible to press the fibers down into said interstices more firmly and with greater force at the beginning of the drawing path, thus accomplishing a more effective drawing operation and a more complete loosening up of the silver during the initial stage of the drawin process.-

According to the illustrated embodiment of the invention, this additional improvement is accomplished by the depression of the feed roller periphery below the level of the drawing plane 9. As will be seen from Fig. l, owing to this arrangement the needles 8 of the upwardly moving falier I at the beginning of the drawing path enter into the silver 3 from a level considerably below the drawingplane 9, and. the fibers of the v pletelypierced by the latter.

sliver 3 are forcibly ressed down into the interstices between the drawing needles 8 so that even closely and adhesively felted slivers are com- At the same time, the silver is. loosened and the fibers therein are disengaged i'rom'one another by the approximately rectangular-bending of the sliver at the point where it enters the drawing 'path and also by the hammering of the upwardly driven faller 1 against the lower surface of the sliver 3. Thus a more effective drawing operation is accomplished at the beginning of the drawing path. while any danger oithe initially pressed down fibers becoming wedged into and jammed in the -V-shaped interstices l between the drawing needles at the end of the drawing path is completely obviated.

I claim:

dition to the, front end of said drawing path, and drawing the sliver off said drawing path at the rear end thereof upwardly out of the bottoms of the V-shaped interstices between adjacent drawing needles at a small angle to said drawing plane.

2. In the method of drawing spinnable slivers I. from coarse, hard and short fibers, such as cocoa- 1. Inthe method of drawing spinnable slivers i'rom coarse, hard and short fibers, such as cocoanut fibers, short sisal fibers, palmetto fibers and the like, by moving the fibers over a drawing path traversed in the direction or the fiber movement by series of tapered drawing needles having their bases disposed in a predetermined drawing plane, the steps of treating the fibers, with a tacky adhesive, feeding the fibers while in a tacky connut fibers, short sisal fibers, palmetto fibers and the like, by moving the fibers over a drawing path traversed in the direction of the fiber movement by series of tapered drawing needles having their bases disposed in a predetermined drawing plane, the steps of treating the fibers with a tacky adhesive, feeding the fibers while in tacky condition to the front end of said drawing path from a level slightly below said drawing plane so that the tacky fibers engage immediately deeply into the interstices between the drawing needles-and drawing the sliver ofl said drawing path at the rear end thereof ii'pwardly out of the bottoms of the V-shaped interstices between ad- Jacent drawing needles at a small angle to said drawing plane.

BAREND GYSBER'I'US I IENDRIKUS VAN nan JAG'I'. 

